With a blown 409, think I'd be for setting it up like a drag car, probably going to be used that way more then once or twice!!!!! As long as the U Joints aren't straight, vibration and premature wear has never been a problem for me on a driveline... especially with such a short driveshaft, may be difficult to set things up like OEM is...... Heck with that kind of torque coming down the shaft, might as well set it up like a drag car so that the car will launch smooth and straight!!!!!

With decent power, also going to be important to get the bars right on the rear end. If not, you can end up with a really squirrely ride when you stand on the power!